*{
    /* 怪异盒模型 */
    box-sizing: border-box;
}
body{
    background-color: #333;
    color:#222;
    overflow-x: hidden;
    margin: 0;
}
.container{
    background-color: white;
    /* 旋转基点为左上角 */
    transform-origin: top left;
    transition:transform 0.5s linear;
    width: 100vw;
    min-height: 100vh;

    padding:50px;

}
.show-nav{
    transform:rotate(-20deg);
}
.circle-container{
    position: fixed;
    top:-100px;
    left:-100px
}
.circle{
    background: #ff7979;
    height: 200px;
    width: 200px;
    border-radius: 50%;
    transition: transform 0.5s linear;
}
.show-nav .circle
{
    transform: rotate(-70deg);
}
.circle button{
    cursor: pointer;
    position: absolute;
    top:50%;
    left:50%;
    height: 100px;
    background-color: transparent;
    border: 0;
}
.circle button:focus{
    outline:none;
}
.circle button#open{
    left: 60%;
}
.circle button#close{
    top: 60%;
    
    transform:rotate(90deg);
    transform-origin: top left;
}
.show-nav+.nav li{
    transform:translateX(0);
    transition-delay: 0.3s;
}
.nav{
    position: fixed;
    bottom: 40px;
    left: 0;
    z-index: 100;
}
.nav ul{
    /* 隐藏圆点 */
    list-style-type: none;
    padding-left: 30px;
}
.nav ul li{
    text-transform: uppercase;
    color:white;
    margin: 40px 0;
    transform: translateX(-130%);
    transition: all 0.5s;
}
  .nav ul li+li{
    margin-left: 15px;
    transform: translateX(-180%);
} 
.nav ul li+li+li{
    margin-left: 30px;
    transform: translateX(-230%);
}   
.nav a{
    color:white;
    text-decoration: none;
    transition: all 0.5s;
}
.nav a:hover{
    color:#ff7979;
    font-weight: bold;
}
.content{
    max-width: 1000px;
    margin:50px auto
}
.content img{
    max-width: 100%;
}
.content h1{
    margin: 0;
}
.content small{
    color:#555;
    font-style: italic;
}
.content p{
    color:#333;
    line-height: 1.5;
}